D6141: make shadows work for windows 100%width or height

[Marco Martin]

mart created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  when a window has 100% width or height (common in the panel),
  it disables the shadows on the sides (or top/bottom) and
  since they are used to compute width/height, if all 4 corner
  shadows are disabled, it will think the resulting shadow pixmap
  is null having width or height == 0
  in this case, use the width of left and right pixmaps for the width
  and height of top and bottom for the height, as they will be the only elements present

TEST PLAN
  100% width panels now have a shadow in wayland, kickoff also in
  the windowd kwin when it doesn't fit in vertical resolution

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6141

AFFECTED FILES
  scene_opengl.cpp

To: mart, #plasma, #kwin, graesslin
Cc: plasma-devel, kwin, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart, lukas
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